The Smart Voltage Scaling(SVS) engine is a piece of hardware which calculates suitable SVS bank voltages to OPP voltage table. Then, DVFS driver could apply those SVS bank voltages to PMIC/Buck when receiving OPP_EVENT_ADJUST_VOLTAGE. 1. SVS driver uses OPP adjust event in [1] to update OPP table voltage part. 2. SVS driver gets thermal/GPU device by node [2][3] and CPU device by get_cpu_device(). After retrieving subsys device, SVS driver calls device_link_add() to make sure probe/suspend callback priority. [1] https://git.kernel.org/pub/scm/linux/kernel/git/vireshk/pm.git/commit/?h=opp/linux-next&id=25cb20a212a1f989385dfe23230817e69c62bee5 [2] https://git.kernel.org/pub/scm/linux/kernel/git/vireshk/pm.git/commit/?h=opp/linux-next&id=b325ce39785b1408040d90365a6ab1aa36e94f87 [3] https://git.kernel.org/pub/scm/linux/kernel/git/matthias.bgg/linux.git/commit/?h=v5.16-next/dts64&id=a8168cebf1bca1b5269e8a7eb2626fb76814d6e2 change since v20: - Rebase to kernel 5.16-rc1 - Separate mt8183 svs as two patches for minimun version support. patch1 (init01 ~ init02) and patch2 (mon mode). - Remove unused flags in each patch. - Move @SVSB_PHASE_ERROR before @SVSB_PHASE_INIT01 for order correctness. - Reorder the struct member comment and coding for the consistenty. Also revise the ambiguous comments. - Use [writel,readl]_relaxed instead of [writel,readl]. - Fix ->efuse_parsing() not return "false" mistake. - Move more commen settings out of svs bank structure for shrinking data structure size. - Split up the "get platform data" and "platform probe" behavior. - Change the naming of "svs_is_supported()" to "svs_is_efuse_data_correct()" for better understanding. - SVSB_DC_SIGNED_BIT is configured as BIT(15) instead of 0x8000. - Add the missing variables comments back in the structure. - Add define "MAX_OPP_ENTRIES" for representing opp total count. - Add more kernel log description when error happens. - Add missing error handler when using nvmem_cell_read(). Roger Lu (8): [v21,1/8] dt-bindings: soc: mediatek: add mtk svs dt-bindings [v21,2/8] arm64: dts: mt8183: add svs device information [v21,3/8] soc: mediatek: SVS: introduce MTK SVS engine [v21,4/8] soc: mediatek: SVS: add monitor mode [v21,5/8] soc: mediatek: SVS: add debug commands [v21,6/8] dt-bindings: soc: mediatek: add mt8192 svs dt-bindings [v21,7/8] arm64: dts: mt8192: add svs device information [v21,8/8] soc: mediatek: SVS: add mt8192 SVS GPU driver .../bindings/soc/mediatek/mtk-svs.yaml | 92 + arch/arm64/boot/dts/mediatek/mt8183.dtsi | 16 + arch/arm64/boot/dts/mediatek/mt8192.dtsi | 39 + drivers/soc/mediatek/Kconfig | 10 + drivers/soc/mediatek/Makefile | 1 + drivers/soc/mediatek/mtk-svs.c | 2461 +++++++++++++++++ 6 files changed, 2619 insertions(+) create mode 100644 Documentation/devicetree/bindings/soc/mediatek/mtk-svs.yaml create mode 100644 drivers/soc/mediatek/mtk-svs.c
